Ram Timings

I'm about to buy some ram for my inspiron 1520. I was going to buy this ram http://www.newegg.com/Product/Product.aspx?Item=N82E16820145012. I went to the corsair website to check the timings and they are 5-5-5-15 T2. A post in the Dual channel Ram thread gave me the impression that all laptop ram is T1. I guess that isnt true, but is most laptop ram T1 or T2? I know that T1 is better, so I'm no hesitant to buy this. I've looked at several other manufacturers websites, and cosair is the only one I've seen that lists the T value.

I also tried to find out the timings of the ram that came in my laptop. I downloaded CPU-Z, but I'm not sure which value, if any, on the memory page is the "T" value. I attached a screen shot of the memory screen in CPU-Z.

Edit: If anyone would be willing to run SiSoftware Sandra and tell me what brand of ram they are running and if it is CR1 or CR2, I would really appreciate it. Thanks!

 

To get the command rate (T! or T2) you have to look at the momory tab of CPU-Z not the SPD tab

Seems that it might not be listed though :s

 

I attached the Memory Screen, but I dont think that it is listed. I think you're the one who told me that most laptop ram is T1, have you ever actually seen this confirmed on CPU-Z or from a manufacturers website?

I checked the websites of every manufacturer I could think of and none of them list the "T" value.

 

What is the diff? I have T2, what does T1 really mean? I have seen 2 Intels both T1 I think they need.

 

This is how BenArcher described it in the other thread "the T1 or T2 which states how often commands can be issues to the ram. T1 meaning 1 per clock T2 meaning 1 per 2 clocks so as you can probably guess T1 is much better."

Im not sure what you mean by two intels since we are talking about ram. Do you mean notebooks with intel processors? Anyway, if we are on the same page, how did you find out this value for your computer. On my 1520 I have CPU-Z, Everest, and SiSoftware Sandra, and I havent been able to find this value in any of them. My Bios doesnt give any info at all on the ram's timing.

Considering that all of the 667Mhz laptop ram that Corsair sells is T2, may be that is the standard for laptop memory? As far as I know Corsair is a pretty reputable company, and it seems unlikely that they would sell ram with higher (worse) timings than the norm.

 

SiSoft go to "Hardware" tab, click on "main board" module then scroll down it will show timings called "CR"

Yes I saw bench marks of two other members and they have Intels and have CR1.

Does anyone think CR1 real world would be much faster than CR2?

 

Are you sure that CR is the same value as T? I have CR1, but that section lists it as 4 banks of 256Mb, that doesnt really make sense. I guess it assumes that it is like a desktop, where you can put more than one ram chip in each channel?

Does anybody know how to find out if any Ram is T1 or T2 without using a program? How are people supposed to distinguish between different types of ram if you cant find this value anywhere? Mabey it's really not important?

 

Yea I'm kind of sure because the value only matches that, other values are like 3,4 or 5 and 11,15 CR stands for command rate so since the T stands for how often commands are issued it is CR=T (CRXT)/T=CR

But how iportant is it anybody? Wiki tells me what it does and oh boy does it sound important, but no opinion.

 

You're right, I just looked it up. "Command Rate (CMD): It is the time taken by the memory chip from being activated (thru its CS – Chip Select – pin) and when any command can be issued to the memory. This parameter carries the letter “T” with it and possible values are 1T or 2T, meaning one clock cycle or two clock cycles, respectively."

It sounds like it can a difference, I dont think it would be huge (mabey it is?), but I think it would be better to have T1.

That still leaves the question of how I can tell when buying ram.

 

If anyone would be willing to run SiSoftware Sandra and tell me what brand of ram they are running and if it is CR1 or CR2, I would really appreciate it. Thanks!

 

What do you want to know I have run. There is a thread where John Ratsey has posted much info. Just ask and I will try and give.

 

Yeah the T1 to T2 diffrence is quite large. From my desktop experiences about 800mhz T1 is same performance as 1000mhz T2. So its about a 25% diffrence.

Most ram does not come with a T1 or T2 rating becasue it is normally left up to the BIOS to select T1 or T2. Often T2 is selected by default in lower end hardware as it is stable at higher speeds. However in high end PC gear the Auto setting try and keep it to T1 until the speed is raised to high then it will switch to T2.

In laptops I'm pretty sure it will come down to what the manufacturer wants. And a lot of the time I'd say they will set to T2 for stability reasons. There is a tool called Memset which you can use to change nearly any ram setting while in windows. version 3.3 is the newest I believe but fining a link to download it is a nightmare. But it might help you out.

 

So they don't say it because it does not deal with the RAM it is the system? Makes sense?

 

Would cheaper ram be more likely to run T2? I know that my notebooks auto setting makes it T1 because that's what it's running on the dell ram. Since Corsair specifically rates theirs at T2 it seems like it would probably be a bad idea to buy theirs.

powerpack, would you be able to find the speeds of some Trancend, PQI, OCZ, G.Skill, and/or Kingston. Basically Im looking for the speeds of anything that they sell on newegg, I didnt ask because I knew that there would be so many different types. I'd like to be sure that it can run T1 before I buy it. Also have you tried any other ram chips in you computer? Does it run T2 with different ram?

Thanks

 

Looks like you should buy some F*ing RAM the CR is decided by chip set!!!

 

relax powerpack its ok :s

anyways yes the CR or T rating is decided by the chip set but the same could be said about your processor speed for FSB. So looking at the corsair stuff I'd say they will garrentee it work at the rated speed and timings (T2). But they won't garrentee it to work at T1. It might work perfectly at T1 but maybe not. But I'd say the laptops chip set would be clever enough to work it out and set it to whatever works best. If it thinks the corsair can handle T1 both the sticks will run at that but if it doesn't it will make both sticks run at T2 timings.

 

I meant that in a funny way, sorry. Also once you know then we will know.

 

I was under the impression that T value was for AMD computers because I could manually set the command rate (the t value) in bios, and it has an on-die memory controller.

Any ram could be run at 1T or 2T, but when you had bigger dimms or 4 dimms it was unstable in 1t somtimes and required 2t to run.